Improvement in counterfeit-coin detecters



J'. A. THOMPSON,

GOUNTERFEIT coIN DETECTOR.

No.189,28 4. ,Patenea Apr11s,1e77.

W. %VM M v of counterfeit coin.

UNITED STATES PATENT OFFICE JOHN A. THOMPSON, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN COUNTERFElT-COIN DETECTERS.

A Specification forming part of Letters Patent No. l 89,284, dated April 3, 1877; application tiled February 23, 18 77.

To all whom it may concern Be it known that I, JOHN A. THOMPSON, of

l the city of Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Counterfeit-Coin Detecters, which improvement is fully set forth in the following specification, reference being had to lthe accompanying drawings, in which- Figure l is a perspective View of my invention; Fig. 2, a side view of my invention when testing a genuine coin. Fig. 3 is a sectional view on the line y y, Fig. l.

This instrument can be struck out completed (except bending the flanges F) by one stroke of a die.

The object of the invention is the detection Counterfeit coin are usually lighter than genuine, and on this fact the invention is based.

F are flanges, on which the instrument rests. These iianges F are bent from the bar or plate C at an angle of from seventy to eighty degrees, as being a suitable angle, but may be at a greater or less angle. The part K of the plate C K that projects beyond the flanges F is supplied with ears or lugs D, arranged in pairs. Each pair is so constructed as to clasp a coin of the denomination designed for it.

The space designed for a United States coin of a given denomination is suitably indicated on the bar K.

The beam or bar C K is balanced, so as to rest on the flanges F, as shown in Fig. 1. When'a genuine United States silver coin is placed in its proper receptacle the bar C K will be tipped down, as shown in Fig. 2, till the point E rests on the table or support L, the bar C K turning on the point H ot' the flanges F.

If a genuine coin of a given denomination is placed in the receptacle corresponding to such denomination the bar K will be tipped, as shown in Fig. 2.

If a counterfeit coin of the proper denomination is placed in either receptacle the instrument remains resting on the flanges F, as shown in Fig. l.

What I claim as new, and wish to secure by Letters Patent, is-

In a counterfeit-coin detecter, the bar C K, provided with the flanges F, and lugs D D,

vsubstantially as shown and described, and' for the purpose set forth.

JOHN A. THOMPSON. Witnesses:

HENRY C. STRONG, F. J. SEYBOLD. 

